Armchair



FIG. l is a perspective view of an armchair showing the new design;

FIG. 2 is a side view of the armchair shown in FIG. 1, with the other side view being a mirror image thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a top view thereof; and,

FIG. 6 is a bottom view thereof.

The broken lines showing of the screws form no part of the claimed design. 

CLAIM The ornamental design for an armchair, as shown and described. 